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Error #1034: Type Coercion failed: DragManagerImpl to IDragManager

My Flex application is divided in modules, and I am having an advanced data grid in one of them.
While clicking on the advanced data grid, I am getting following error:
TypeError: Error #1034: Type Coercion failed: cannot convert mx.managers::DragManagerImpl@1ae729c1 to mx.managers.IDragManager.     at mx.managers::DragManager$/get impl()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\DragManager.as:202]     at mx.managers::DragManager$/get isDragging()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\DragManager.as:242]     at mx.controls.listClasses::AdvancedListBase/dragScroll()[E:\dev\4.y\frameworks\projects\advancedgrids\src\mx\controls\listClasses\AdvancedListBase.as:6821]     at Function/http://adobe.com/AS3/2006/builtin::apply()     at SetIntervalTimer/onTimer()     at flash.utils::Timer/_timerDispatch()     at flash.utils::Timer/tick() I fixed it by adding creating an instance of IDragManager in my main application class:
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